After reboot, check firmware version again under Information → System.
Before updating, check which version you are running. Update Software in SAGEMCOM F-ST 3890 V3 Delta
Steps:
SG4X_... or FS3890-...).Updating router firmware is generally safe, but a power outage or mistake can brick the device. Follow this checklist religiously. After reboot, check firmware version again under Information
| Step | Action | Why It Matters |
|------|--------|----------------|
| 1 | Backup Current Configuration | If the update resets settings, you can restore Wi-Fi names, passwords, and port forwards. |
| 2 | Use a Wired Ethernet Connection | Updating over Wi-Fi is risky—a single interference spike can corrupt the file. |
| 3 | Disable Wi-Fi on your PC | Prevents accidental fallback to wireless during the upload process. |
| 4 | Close all other apps (torrents, streaming) | Frees bandwidth and CPU. The router needs full focus. |
| 5 | Connect to stable power (no UPS? avoid storms) | A power loss during flashing = bricked router. |
| 6 | Know your router’s current firmware version | Write it down. You’ll need it later to confirm success (e.g., V1.02.00 → V1.03.12). | Before updating, check which version you are running